Adds CI for webdriver tests

[orangemug]

Github action CI workflows added for webdriver tests.

I've also refactored the ./scripts/e2e-* scripts. These scripts were somewhat unique compared to the other scripts. They are now more inline with the other scripts in that directory and run via

% yarn e2e --help                               
Usage: yarn e2e <command> [options]

Commands:
  yarn e2e serve              start test server
  yarn e2e test:ci [env]      runner for CI (github-actions)
  yarn e2e test:local         run webdriver tests locally
  yarn e2e test:browserstack  run webdriver tests on browserstack
  yarn e2e selenium:grid      start selenium grid (test linux)

Options:
  --help     Show help                                                 [boolean]
  --version  Show version number                                       [boolean]

I've also added an experimental linux runner see

tldraw/e2e/README.md

Lines 320 to 333 in 2cca4dd

	## Experimental
	You can now also run _linux_ tests on _macos_. To do this start up a selenium grid with. Note, you **must** have `docker` installed locally.
	```sh
	yarn e2e selenium:grid
	```
	Then run
	```sh
	yarn e2e test:local --os linux -b firefox
	```
	**Note**: Currently only `firefox` is supported. You can hit <http://localhost:7900/?autoconnect=1&resize=scale&password=secret> to see a VNC of the app runing in a docker container.

Change Type

• tests — Changes to any testing-related code only (will not publish a new version)

Release Notes

• Github action CI workflows added for webdriver tests
• Refactored e2e test runner

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Name	Status	Preview	Updated (UTC)
examples	✅ Ready (Inspect)	Visit Preview	May 12, 2023 3:25pm
tldraw-docs-staging	✅ Ready (Inspect)	Visit Preview	May 12, 2023 3:25pm

[orangemug]

Blocked on: Missing keys for BROWSERSTACK_USER and BROWSERSTACK_KEY these need to be added to the github-actions secrets.